I think Mindwipe Guy's powers aren't as effective on specials. Remember, he also could hinder Matt's telepathy, but Matt could still manage to pluck out Claire's name from Secret Agent Guy's head.

As for the symbol Niki has tattooed, that's been showing up in other places. It appeared in the elder Suresh's computer, and a hose at the crime scene Matt was investigating took the same shape. It's supposedly some kind of fractal pattern to predict where the supers are going to show up. That's what Sylar is using to find people and kill them.

Knutreturns said: Spoken like the true Greatest RDCW Champ!

All hail King Snarf!